Machine for reciprocating a tool



Jan. 14, 1941. J. w. REED MACHINE FOR RECIPROCATING A TOOL Filed April'26, 1940 3 Sheets-Sheet l J k Wit 980d IN VEN TOR.

ATTORNEYS.

Jan. 14, 1941. w REED 2,228,485

' MACHINE FOR RECIPROCATINGA TOOL Filed April 26/1940 3Sheets-Sheet 24'4TT0RNEYS.

Patented Jan. 14, 1941 UNITED STATES PATENT OFFICE 2 Claims.

This invention aims to provide a simple but effective power-driven meansfor imparting reciprocation to a hack saw, file, sand block, or thelike.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the presentinvention appertains.

With the above and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be made within thescope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawings:

Fig. 1 shows, in side elevation, a device constructed in accordance withthe invention;

Fig. 2 is a horizontal section taken approximately on the line 2-2 ofFig. 1;

Fig. 3 is a section on the line 3-3 of Fig. 2;

Figs. 4, 5 and 6 are sections taken, respectively, on the lines 4-4, 5-5and 66 of Fig. 3;

Figs. 7 and 8 are diagrams illustrating the operation of the toolcarrier.

In carrying out the invention, there is provided an elongated box-likecasing C, including a body I having a longitudinal midrib 2, extendedinwardly from one side of the body. The opposite side of the body I isclosed by a cover 3, attached by securing elements 4 to the midrib 2,and by securing elements 5 to the body I.

Vertical holders 6 are located near the ends of the casing C and havevertically elongated recesses I that face the cover 3, the holders beingheld in place by certain of the securing elements 5. A loop-shaped guideslot 8 is formed in the cover 3, and extends lengthwise of the casing C.

A power-driven shaft 9 is disposed longitudinally of the casing C and isjournaled for rotation in the body I, at one side thereof. The shaft 9carries a worm l0, meshing with a worm wheel ll, mounted to turn on astub shaft l2 carried by the side portion of the body I. A drivingsprocket wheel I4 is journaled on the stub shaft [2 and is connectedwith the worm wheel II, to turn therewith.

An idle sprocket wheel I5 is located at the end of the body I which isremote from the driving sprocket wheel M, the sprocket wheel l5 beingjournaled on a stub shaft [6, mounted in the side of the body I. Thesprocket wheels l4 and I5 are operatively connected by a sprocket chainl1. 1

A tool carrier I8, in the form of a bar, extends lengthwise of thecasing C and is received in the recesses I of the holders 6. The toolcarrier l3 has two movements. One of these movements is a longitudinalmovement, and the other is a transverse movement parallel to the drivingsprocket wheel M, an observation which will be understood readily whenFig. 4 is noted. The tool carrier I8 is shown as provided withrectangularly disposed arms I9, carrying a hack saw 20, but the tool tobe reciprocatedis a matter of choice. The machine will operate a sandblock (not shown), a file (not shown), or any analogous tool.

A bracket 2| is secured to the sprocket chain IT and has a lateral foot22, receiving a ball 23 on the inner end of a securing element 24,mounted in the tool carrier E8. The securing element 24 is adapted tomove in the loopshaped slot 8 of the cover 3.

On itsinner side, the tool carrier I8 is. provided with a loop-shapedgroove or guide 25. The cover 3 carries an outwardly extended projection26, received in the loop-shaped groove 25 of the tool carrier IS. Theprojection 26 is coaxial with respect to the stub shaft l2 of Fig. 3,and is indicated in that figure by a dotted line.

The driving train for the tool carrier I8 includes the power shaft 9,the worm III, the worm wheel H, the driving sprocket l4, and the chainll. The bracket 2i on the sprocket chain, the foot 22 and the ball 23cause the securing element 24 to move in an orbit, that orbit beingdetermined, since the securing element 24 traverses the loop-shaped slot8 of the part 3 of the casing C. Since the securing element 24 ismounted in the tool carrier l8, the tool carrier advances with the hacksaw in contact with the work, the tool carrier being elevated at theforward end of the working stroke, and being carried backwardly, sincethe securing element 24 moves in the loop-shaped slot 8 of the casingpart 3.

The fixed projection 26 cooperates with the loop-shaped groove of thetool carrier [8, to maintain the tool carrier in proper workingposition, an observation which will be understood clearly when Figs. 7and 8 of the drawings are noted.

The device is of simple construction but will be found thoroughlyeffective to consummate the object set forth in the opening portion ofthis specification.

Having thus described the invention, what is claimed is:

1. A machine for reciprocating a tool, illustratively represented by ahack saw, comprising a support having an elongated loop-shaped guide, atool carrier having an elongated loopshaped guide, a projection on thecarrier and received in the guide of the support, a fixed projection onthe casing and received in the guide of the tool carrier, and. means onthe support for moving the projection of the carrier in an orbitdetermined by the guide of the support.

2. A machine for reciprocating a tool, illustratively represented by ahack saw, comprising a support having an elongated loop-shaped guide, atool carrier having an elongated loopshaped guide, a projection on thecarrier and received in the guide of the support, a. fixed projection onthe casing and received in the guide of the tool carrier, a sprocketchain mounted to move on the support, and a connection between thesprocket chain and the projection of the carrier, the sprocket chain andthe connection constituting means for moving the projection of thecarrier in an orbit determined by the guide of the support.

JOHN W. REED.

